Adjustable support for incandescent lamps.



No. 793.030. PATENTBD JUNE 20, 1905.

P. FORG.

ADJUSTABLE SUPPORT FOR INGANDESCENT LAMPS.

APPLICATION FILED JUNE 4, 190a.

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PATENT OFFICE.

ADJUSTABLE SUPPORT FOR INCANDESCENT LAMPS.

SPECIFICATION forming part of Letters Patent No. 793,030, dated June 20,1905.

Application filed June 4,1903. Serial N! 159,994.

To (11/ lrrlmnb 1 6 may concern.-

Be it known that I, PETER FORG, a citizen of the United States, residingin Somerville, in the county of Middlesex and State of assachusetts,have invented an Improvement in Adjustable Supports for IncandescentLamps, of which the following description, in connection with theaccompanying drawings, is a specilication, like characters on thedrawings representing like parts.

This invention relates to an adjustable support especially designed andadapted for use in connection with incandescent electric lamps, and hasfor its object to provide a simple and efficient support for the purposespecified.

The invention is herein shown as embodied in a support especiallyadapted to be secured to the ceiling of a room, and particularly to theceiling or an overhead structure in a machine or other shop, and thesaid support is capable of being moved in a circular path to properlyposition the electric lamp with relation to the machine and of beingsecured in the position desired. Provision is also made for raising andlowering the incandescent lamp with relation to its support, as will bedescribed. These and other features of this invention will be pointedout in the claims at the end of this specification.

Figure 1 is an elevation of an incandescent lamp hung from a supportembodying this invention; Fig. 2, a detail in section and on an enlargedscale of the upper portion of the support shown in Fig. 1; Fig. 3, asectional detail, on an enlarged scale, to be referred to; Fig. t, adetail in elevation and on an enlarged scale, to be referred to; Fig. 5,a crosssection on the line 5, Fig. i; and Fig. 6, a similar section withthe sleeve of insulation turned into a position substantially oppositeto that shown in Fig. 5.

Referring to the drawings, It represents an incandescent electric lampof any usual or suitable construction, which has its conductingcord 6,connected with the rosette 0, attached to the ceiling of a room or otheroverhead structure, such as a beam, and which is represented by the line(I. To facilitate description, 1' shall hereinafter refer to theoverhead structure (I as the ceiling of the room in which the lamp (1 islocated.

The ceiling (1 has attached to it a support for the lamp (1, and thesaid support, in accordance with this invention, comprisesastationarymember and a movable member. The stationary member may be made as hereinshown and consists of a concaved shell f, provided with a flange g,having suitable holes for the passage of screws /1/, by which the shellmay be secured to the ceiling. The shell f is provided with a circularopening, through which projects a portion of a ball or sphere i of adiameter larger than the diameter of the opening in the shell. The ballif forms part of the movable member of the support and fits a socket orcircular recess in a disk l located within the shell f and securedthereto by the rivets or in any other suitable manner. The ball z isprovided with a central hole or opening m extended through it andprovided for a portion of its length with screwthreads 11, which areadapted to be engaged by screw-threads u on a rod 1), provided beyondthe screw-threads with a conical point or end (1. (See Fig. 2.)

The hole or opening m, in the ball may be of the same diameterthroughout its length; but I prefer to make the unthreaded portion ofthe hole of slightly larger diameter to facilitate the removal of therod 2) from the ball when so desired. The rod 92 has connected to it bya coupling 10, of insulation, a second and longer rod 19., which may beprovided at its lower end with a handle 13. The coupling 10 may be madeas herein shown and consists of a piece of wood or other suitableinsulating material provided at its opposite ends with sockets 14 15,(see Fig. 3,) into which the ends of the rods 7) 12 are inserted andwherein they are secured by pins 16 or in any other suitable manner. Thesockets 14 15 are separated from each other. The insulating-coupling 10may be provided at its opposite ends with suitable caps 17.

The rod 12 is preferably provided, as herein shown, with a device forsupporting the cord 7) and which is revoluble on the said rod. The

device referred to may be made as herein shown and consists of a yoke orforkedshaped piece 20, (see Figs. 1, 5, and 6,) having its arms 21provided with holes, through which the rod 12 extends, the said armsbeing open for the entrance of the cord 6 into a sleeve 22, ofinsulating material, which sleeve is revolubly mounted in the arms 21and is provided with a longitudinally-extended slot 23, which is adaptedto register with the slot in the arms 21 (see Fig. 6) when it is desiredto place the cord 7) into or remove it from said sleeve and which isadapted to be carried out of line with the slot in the arms 21 (see Fig.5) when it is desired to retain the cord Z) in said sleeve. The yoke 20is revoluble on the rod 12, but is retained thereon against longitudinalmovement by a screw 25 extended through the back piece of the yoke intoan annular groove 26 in the rod 12. I

As thus far described it will be seen that by turning the handle 13 inone direction the pointed end (1 of the rod p may be disengaged from thewall of the recess or socket 7', thereby leaving the rod 12 free to bemoved into any desired position, with the ball i as a center or pivot,and when the rod 12 has been moved in such position as to properlyposition the lamp (4 the ball z is then locked in the socket by turningthe rod 12 so as to bring its pointed or conical end q into engagementwith the wall of the socket j with suflicient force to resist movementof the ball in said socket. Provision is also made for permitting thelamp c to be raised and lowered to adjust it vertically with relation tothe work and for automatically holding or retaining said lamp in itsadjusted position. To this end the rod 12 has mounted on it acounterbalancing-weight 30 for the lamp, which weight is movablelongitudinally on the said rod and is connected by a cord 31 01' otherflexible means with the cord 6, the cord 31 passing over a pulley 32,mounted in a yoke or forked piece 33, fitted loosely upon the rod 9above the insulating-coupling 10 and resting thereon.

By reference to Fig. 1 it will be seen that when the lamp c is moveddownward the weight 30 is moved upward on the rod 12 and that when thehand is removed from the lamp or the cord 6 the lamp will be maintainedby the weight in the position to which it has been moved by theoperator.

Vhen the lamp is moved upward by the operator, the weight moves downwardon the rod, and when the lamp has been elevated to the desired positionthe operator releases the same, and the weight automatically retains thelamp in its adjusted position.

I have herein shown one embodiment of my invention; but I do not desireto limit my invention to the particular construction shown.

I claim- 1. In an apparatus of the class described, in combination, asocketed member, a ball or spherical device movable in said socketedmember and having a hole or opening extended through it and providedwith screw-threads, a threaded rod movable in said screw-threadedopening and adapted to engage said socketed member to lock the ball frommoving in its socket, a second rod connected with but insulated fromsaid threaded rod, a device on said second rod for engaging the cord ofan incandescent lamp, a weight movable on said second rod, a pulleysupported by the threaded rod, and a flexible connection passed oversaid pulley and connected to said weight and cord, substantially asdescribed.

2. In an apparatus of the class described, in combination, a socketedmember, a movable member cooperating therewith and comprising a ball anda rod extended therefrom, a weight movable longitudinally on said rod,an incandescent lamp attached to said rod, a flexible conductor leadingto said incandescent lamp,aflexible connection between said weight andflexible conductor, and means over which the flexible connection ispassed, for the purpose specified.

3. In an apparatus of the class described, in combination, a rod, aforked device revolubly mounted on said rod and provided with an openingin its arms, and a sleeve revolubly mounted in the arms of said forkeddevice and provided with a slot adapted to register with the opening insaid arms, substantially as and for the purpose specified.

4. In an apparatus of the class described, in combination, a socketedmember, a movable member cooperating therewith and comprising a ball anda rod extended therefrom, a counterbalancing device movable on said rod,a device suspended from said rod, a cord attached to said suspendeddevice, a flexible connection between said counterbalancing device andsaid cord, and means over which said flexible connection is passed,substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two sul scribing witnesses.

PETER FORG.

Witnesses:

J AS. H. CHURCHILL, J. MURPHY.

IIO

